A variation of the astable multivibrator circuit that is called a one-shot multivibrator, because the LED comes on once each time the switch is turned on. The 33k ohm and variable resistor with the 100 microfarad capacitor control how long the LED is on. In the beginning of the video, the LED is on for a few seconds and then goes out. I increase the resistance of the variable resistor and the LED stays on longer.
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